My opinion
Luis,
Buying a type-rating these days is one of the only ways for low houred pilots to give themselves a competitive edge. You'll always have the argument crop up - "Don't pay for a type-rating because you'll be whoring yourself out to the airlines balh blah blah". The truth of the matter is that to join a lot of airlines, YOU MUST be willing to pay for a type rating.
However, in saying that, the market is changing for the better and the whole paying for a type rating idea will fade out quite rapidly (but not disappear) due to simple economics i.e. supply and demand.
Wherever the industry is at, the only safe way to play it is to have a contract saying that "On successful completion of the type rating course you will be offered a contract of employment with us." I seriously don't understand people who buy type ratings just for the sake it, it makes no commercial sense. But that's me.
Hope this helps,
Simon.